<template>
  <view v-if="goods_info.goods_name" class="goods-detail-container">
    <!-- 轮播图区域 -->
    <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
      <swiper-item v-for="(item, i) in goods_info.pics" :key="i">
        <!-- 把当前点击的图片的索引，传递到 preview() 处理函数中 -->
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>

    <!-- 商品信息区域 -->
    <view class="goods-info-box">
      <!-- 商品价格 -->
      <view class="price">￥{{ goods_info.goods_price }}</view>
      <!-- 信息主体区域 -->
      <view class="goods-info-body">
        <!-- 商品名称 -->
        <view class="goods-name">
          {{ goods_info.goods_name }}
        </view>
        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <!-- 运费 -->
      <view class="yf">快递：免运费</view>
    </view>

    <!-- 商品介绍区域 -->
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>

    <!-- 商品导航组件 -->
    <view class="goods_nav">
      <!-- fill 控制右侧按钮的样式 -->
      <!-- options 左侧按钮的配置项 -->
      <!-- buttonGroup 右侧按钮的配置项 -->
      <!-- click 左侧按钮的点击事件处理函数 -->
      <!-- buttonClick 右侧按钮的点击事件处理函数 -->
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick" @buttonClick="buttonClick"></uni-goods-nav>
    </view>
  </view>
</template>

<script>
import { mapState, mapMutations, mapGetters } from 'vuex'

export default {
  computed: {
    ...mapState('m_cart', []),
    ...mapGetters('m_cart', ['total'])
  },
  data() {
    return {
      // 商品详情对象
      goods_info: {},
      // 左侧按钮组的配置对象
      options: [
        {
          icon: 'shop',
          text: '店铺'
        },
        {
          icon: 'cart',
          text: '购物车',
          info: 0
        }
      ],
      // 左侧按钮组的配置对象
      buttonGroup: [
        {
          text: '加入购物车',
          backgroundColor: '#ff0000',
          color: '#ffffff'
        },
        {
          text: '立即购买',
          backgroundColor: '#ffa200',
          color: '#ffffff'
        }
      ]
    }
  },
  methods: {
    ...mapMutations('m_cart', ['addToCart']),
    // 获取商品详情的方法
    async getGoodsDetail(goods_id) {
      const { data: res } = await uni.$http.get('/api/public/v1/goods/detail', { goods_id })
      if (res.meta.status !== 200) return uni.$showMsg()
      console.log('商品详情数据为：', res.message)

      res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display: block;" ').replace(/webp/g, 'jpg')

      this.goods_info = res.message
    },
    // 实现轮播图的预览效果
    preview(i) {
      // 使用 uni.previewImage() 方法预览图片
      uni.previewImage({
        // 预览时，默认显示图片的索引
        current: i,
        // 所有图片 url 地址的数组
        urls: this.goods_info.pics.map(x => x.pics_big)
      })
    },
    onClick(e) {
      // console.log(e)
      if (e.content.text === '购物车') {
        uni.switchTab({
          url: '/pages/cart/cart'
        })
      }
    },
    buttonClick(e) {
      if (e.content.text === '加入购物车') {
        // 组织一个商品的信息对象
        const goods = {
          goods_id: this.goods_info.goods_id, // 商品的id
          goods_name: this.goods_info.goods_name, // 商品的名称
          goods_price: this.goods_info.goods_price, // 商品的价格
          goods_count: 1, // 商品的数量
          goods_small_logo: this.goods_info.goods_small_logo, // 商品的图片
          goods_state: true // 商品的勾选状态
        }

        // 通过 this 调用映射过来的 addToCart 方法，把商品信息对象存储到购物车中
        this.addToCart(goods)
      }
    }
  },
  onLoad(options) {
    const goods_id = options.goods_id
    this.getGoodsDetail(goods_id)
  },
  watch: {
    total: {
      handler(newVal) {
        const findResult = this.options.find(x => x.text === '购物车')
        if (findResult) {
          findResult.info = newVal
        }
      },
      immediate: true
    }
  }
}
</script>

<style lang="scss">
.goods-detail-container {
  padding-bottom: 50px;

  swiper {
    height: 750rpx;

    image {
      width: 100%;
      height: 100%;
    }
  }

  .goods-info-box {
    padding: 10px;
    padding-right: 0;

    .price {
      color: #c00000;
      font-size: 18px;
      margin: 10px 0;
    }

    .goods-info-body {
      display: flex;
      justify-content: space-between;

      .goods-name {
        font-size: 13px;
        margin-right: 10px;
      }

      .favi {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;

        width: 120px;
        font-size: 12px;
        border-left: 1px solid #efefef;
        color: gray;
      }
    }
    .yf {
      font-size: 12px;
      color: gray;
      margin: 10px 0;
    }
  }

  .goods_nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
  }
}
</style>
